. If _____ to look after luggage for someone else, inform the police at once.
A．a(chǎn)skedB．to askC．a(chǎn)skingD．having asked
A

試題分析：句意為：如果有人要你替他看管行李，立即聯(lián)系警察。ask 的主動形式后不能直接跟不定式作賓語，只能跟不定式作賓補，所以可以直接排除 B、C、D 三項。完整的句子應(yīng)該是If you are asked to look after luggage for someone else,當(dāng)從句中的主語和主句的主語一致的時候，可以省略從句的主語和be動詞，選A。
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